This GIS overlay is a component of the U.S. Geological Survey, Woods Hole Science Center's, Gulf of Mexico ArcView GIS database. The Gulf of Mexico GIS database is intended to organize and display USGS held data and provide on-line (WWW) access to the data and/or metadata.

Purpose:

This ArcView shapefile an additional GIS overlay. It contains the names of various seafloor features (basins, slopes, knolls, ridges, etc.) for the Gulf of Mexico.

Supplemental_Information:

This ArcView shapefile was created from a Microsoft Excel spread sheet that was found at the National Oceanic and Atmospheric Administration, National Geophysical Data Center's website. The information contained in the spread sheet was edited to include only those features that would pertain to the planned Gulf of Mexico Internet Map Server for the USGS, Woods Hole Science Center. Therefore, this is not a complete listing as would be found from NOAA-NGDC.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2005

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -97.500177

East_Bounding_Coordinate: -79.916429

North_Bounding_Coordinate: 31.000234

South_Bounding_Coordinate: 23.500362

Keywords:

Theme:

Theme_Keyword_Thesaurus: General

Theme_Keyword: U.S. Geological Survey

Theme_Keyword: USGS

Theme_Keyword: Coastal and Marine Geology Program

Theme_Keyword: CMGP

Theme_Keyword: Woods Hole Science Center

Theme_Keyword: WHSC

Theme_Keyword: National Oceanic and Atmospheric Administration

Theme_Keyword: NOAA

Theme_Keyword: National Geophysical Data Center

Theme_Keyword: NGDC

Theme_Keyword: Gulf of Mexico database

Theme_Keyword: feature names

Theme_Keyword: seafloor features

Theme_Keyword: ArcView

Theme_Keyword: point shapefile

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: oceans and estuaries

Theme_Keyword: location

Place:

Place_Keyword_Thesaurus: General

Place_Keyword: Gulf of Mexico

Access_Constraints: None

Use_Constraints:

Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

Spreadsheet contains seafloor feature names, general classification for the type of feature, latitude and longitude coordinate of feature, numeric code, source of feature name and additional comments relating to the name and source of feature name.

Process_Step:

Process_Description:

The Microsoft Excel data file was downloaded from the NOAA-NGDC site and read into Excel. Records that did not contain a latitude/longitude coordinate for a feature name was deleted from the spreadsheet. The text fields containing the latitude and longitude coordinate of the seafloor feature were then copied and added to the spreadsheet as the first two fields. These fields were added so numeric latitude longitude fields recorded as signed decimal degrees could be created later. The modified spreadsheet was saved as a comma separated values text file.

Source_Used_Citation_Abbreviation: ib1234gz.xls

Process_Date: 19990614

Source_Produced_Citation_Abbreviation: gomnames.csv

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Valerie Paskevich

Contact_Organization: U.S. Geological Survey

Contact_Position: Information Specialist / GIS Coordinator

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Country: USA

Contact_Voice_Telephone: (508) 548-8700 x2281

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: vpaskevich@usgs.gov

Process_Step:

Process_Description:

The comma separated values file was processed on a UNIX operating system to convert the first two text fields that contained the feature coordinates to numeric, signed decimal degree fields.

Source_Used_Citation_Abbreviation: gomnames.csv

Process_Date: 19990614

Source_Produced_Citation_Abbreviation: gomnames.txt

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Valerie Paskevich

Contact_Organization: U.S. Geological Survey

Contact_Position: Information Specialist / GIS Coordinator

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Country: USA

Contact_Voice_Telephone: (508) 548-8700 x2281

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: vpaskevich@usgs.gov

Process_Step:

Process_Description:

The text file with geographic coordinates was read into ArcView as a table. Features locations that did not fall within the bounds of the Gulf of Mexico IMS were eliminated, and the remaining table information was converted to an ArcView shapefile.

Source_Used_Citation_Abbreviation: gomnames.txt

Process_Date: 19990614

Source_Produced_Citation_Abbreviation: gomnames.shp

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Valerie Paskevich

Contact_Organization: U.S. Geological Survey

Contact_Position: Information Specialist / GIS Coordinator

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Rd.

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Country: USA

Contact_Voice_Telephone: (508) 548-8700 x2281

Contact_Facsimile_Telephone: (508) 457-2310

Contact_Electronic_Mail_Address: vpaskevich@usgs.gov

Process_Step:

Process_Description:

The data were projected from geographic NAD27, to geographic NAD83.

Process_Date: 20040107

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Position: Computer Specialist

Contact_Address:

Address_Type: mailing and physical address

Address: 384 Woods Hole Road

City: Woods Hole

State_or_Province: MA

Postal_Code: 02543-1598

Country: USA

Contact_Voice_Telephone: 508-548-8700

Contact_Facsimile_Telephone: 508-457-2310

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 254

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000000

Longitude_Resolution: 0.000000

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: gomnames

Entity_Type_Definition: Shapefile Attribute Table

Entity_Type_Definition_Source: ESRI

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 223083

Range_Domain_Maximum: 231080

Attribute:

Attribute_Label: LON

Attribute_Definition: Longitude coordinate of feature recorded in decimal degrees.

Attribute_Definition_Source: USGS

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -97.5000

Range_Domain_Maximum: -79.91667

Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: LAT

Attribute_Definition: Latitude coordinate of feature recorded in decimal degrees

Although this derived data set has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials.

Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: SHP

Format_Version_Number: 3.3

Format_Specification: ESRI Shapefile

Format_Information_Content:

The SHP file contains the geospatial data. The SHX file contains the index of the geospatial data. The DBF file contains the attribute data in dBase format. The PRJ file contains the coordinate system information (optional). The AVL file contains the legend information (optional). The SBN and SBX files contain the spatial index of the geospatial data (optional). The XML file contains the metadata describing the data set <data set name>.shp.xml. An ASCII version of the metadata file. A browse graphic showing the data layer coverage and extent (optional).

These data are available in Environmental Systems Research Institute (ESRI) shapefile format. The user must have ArcGIS® or ArcView® 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of the importing data. A free data viewer, arcexplorer, capable of displaying the data is available from ESRI at www.esri.com.